So, in other words, you decry scientific speculation as to the presence of clay in comets as something unprovable, yet your view rests on faith.
If you want to believe in Genesis, that's your perogative, but don't turn around and decry scientific theorizing.
But it would be too huge a leap from the existence of clay, to the existence of life. We have a whole lot of clay on planet Earth. Nobody has ever observed life beginning in clay spontaneously.